Sorry about that! I did send the crash log to Apple - I don't know if they eventually filter their way back to you. I also kept a copy of the full crash log - I can email that to you if it would be helpful. The cause was:

Application Specific Information:
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSDictionaryM setObject:forKey:]: key cannot be nil'
abort() called
terminating with uncaught exception of type NSException

Thanks Jerry. Version 3.0.3 now working well on both my Macs.

After upgrade to v3.0.3 on my desktop (Big Sur) BookMacster was crashing on startup, but after removing all traces of the app with AppCleaner and doing a clean re-install it's now working perfectly.

I really appreciate your quick response to these teething problems - very impressive support and an excellent app. Thank you!

Thanks For all your help.

In an effort to eliminate DropBox from the equation I created a new empty collection on my laptop, stored locally in the Documents folder, imported my set of bookmarks to it from a browser, then enabled syncing (after removing sync from the DropBox collection). Unfortunately I still have the same 2 problems - all bookmarks are always re-written and Chrome gets multiple duplicates. The sync result says 4284 items deleted from Chrome and 3518 written to it (the correct number, I think). But I still end up with duplicates. On the next sync it tells me it needs to delete 4278 items. BTW Chrome is not signed into a Google account.

I don't know if this helps you at all!

Version 3.0.2:

Collection now opens automatically when opening BookMacster - thanks!

Every sync still deletes every single bookmark in each browser and then re-writes them all again (in Safari, Chrome and Firefox). Which means that a change to the collection on one Mac triggers my other Mac to try and sync the change, which flags a sync failure because it exceeds my safe limit.

On my desktop Mac (Big Sur/Intel) Safari, Chrome and Firefox do all get the right set of bookmarks after a sync.
On my laptop (Monterey/M1 Pro) Safari and Firefox get the right set of bookmarks, Chrome gets the full set plus random duplicate folders still. I have tried a "Reset and Start Over" with BookMacster, but no difference.

TastyTofu wrote on Sep 15^th, 2022 at 8:57am:

The advantage of macOS Notification Center, compared to the old methods, is that apps no longer plop a box in the middle of your screen whenever they feel like it.  The disadvantage is that it requires a lot of fiddling.  I read that you are past that now.

TastyTofu wrote on Sep 15^th, 2022 at 8:57am:

Yes, from another user's report I think this is something we may need to fix in a future version 3.0.2.  Probably a day or two.  The syncing issues you reported may or may not be related to this.  We shall fix the first thing first.

Thanks very much for the hard work Jerry. I appreciate this is still a beta and there will be a few problems to iron out.

I now have syncing to Firefox and Chrome operational (I had to uninstall and re-install the Firefox plugin). I had to do a lot of fiddling to get notifications working - BkmxNotifier-B didn't appear in Notification Centre settings, although A was there. After giving BkmxAgent full disk access and a full reboot it finally appeared.

However I now have two problems:

1. I have my collection set to automatically open when I start BookMacster. However, instead I get error 523499 when I start the app. The collection doesn't open and I have to manually open it and set up syncing again. The collection is stored in a folder on DropBox. This was working fine in version 3.0.
[Edit]: Also reported here: https://sheepsystems.com/discuss/YaBB.pl?num=1663201675

2. When BookMacster does a sync is deletes all bookmarks in each browser and re-writes the entire collection (maybe a result of the issue above?). This works OK in Safari and Firefox. But in Chrome it writes the full set of bookmarks but then adds a random selection of duplicate folders to the top level - I have all my bookmarks in the Bookmarks Bar, so I get the normal set of folders and then about 30 additional folders randomly picked from my collection. Each time I do a sync the set of additional duplicates changes - it seems totally random which ones get added.

NOTE: it might be worth adding a warning for users who, like me, sync bookmarks across multiple computers via a cloud service, to avoid the collection file (and backup) being corrupted during the upgrade of the file storage format. Is DropBox still a good choice for this?

Unfortunately version 3.01 does not fix Error 145725, that persists after repeated attempts to uninstall and reinstall the chrome extension on my MAC -latest chrome version and OSX 12.6.
Advise?